1 Do a good job in field investigation and forecasting Agricultural technology departments do a good job in monitoring corn spot disease. It is best to train farmers to understand the hazards of corn spot disease and establish the prevention and control concept of “prevention first, comprehensive prevention and controlâ€.
2 Selecting good disease-resistant varieties Planting excellent disease-resistant varieties is the main measure to control corn leaf spot disease. And pay attention to reasonable collocation and rotation of varieties, can not grow a single species in large areas.
3 In the early stage of disease prevention, the diseased leaves at the bottom of the plant are destroyed in time, and the fields are burned or buried. The plant is densely planted, which enhances the ventilation and light transmission in the field, enhances disease resistance, applies basic fertilizer, and applies fertilizers properly. From jointing to heading during the heading, fertilizer-free plots are topdressed in time.
4 Chemical control Prophylactic drug prevention in advance is the key to prevent and control corn spot disease. To change the concept of drug application after the widespread occurrence of large leaf spot disease, after the prevention and control period was moved forward, the application of pesticides was operability strong, easy to promote, control costs are reduced, and control effectiveness can reach 70% to 80%. Application period: Application of pesticides in the early stage of corn growth flares, that is, the application of spraying at the time of the beginning of the disease, 7~10 days intervals, the first spraying should be earlier than late, continuous spraying 2-3 times. The best choice for the agent is the internal absorption agent, which can be selected from difenoconazole, propiconazole, beclomezole, mancozeb, and other agents. Combined with potassium dihydrogen phosphate, it can promote early maturation and improve prevention and control. effect. Optional self-propelled high pole spray or aircraft spraying. The entire leaf is sprayed, focusing on the spraying of leaves above the ear position.
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